import sys
from PyQt5.QtWidgets import (QWidget, QPushButton,
    QHBoxLayout, QVBoxLayout, QApplication)
 
 
class Example(QWidget):
     
    def __init__(self):
        super().__init__()
         
        self.initUI()
         
         
    def initUI(self):
         
        okButton = QPushButton("OK")
        cancelButton = QPushButton("Cancel")
 
        hbox = QHBoxLayout()
        hbox.addStretch(1)
        hbox.addWidget(okButton)
        hbox.addWidget(cancelButton)
 
        vbox = QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox)
         
        self.setLayout(vbox)   
         
        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('Buttons')   
        self.show()
         
         
if __name__ == '__main__':
     
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())
